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LCD connected to additional LCD through multiple flexible printed circuit boards

a flexible printed circuit board and lcd technology, applied in the field of liquid crystal modules, can solve the problems of further miniaturization and achieve the effect of reducing the size of the main lcd devi

Inactive Publication Date: 2007-06-19
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a liquid crystal module that allows for further miniaturization of LCD devices. The module includes separate LCD devices connected to a flexible substrate with a semiconductor chip for driving them. The flexible substrate is connected to another flexible substrate with signal transmission wiring, eliminating the need for common wiring dedicated for one of the LCD devices. The module can be mounted in a cellular mobile phone, allowing for compact wiring within a limited mounted region. The technical effect of the invention is to enable a smaller and more efficient liquid crystal display device.

Problems solved by technology

As such, problems arise in that the configuration requires an edge region for forming the common wiring of the subordinate LCD device in two end portions of the base glass of the main LCD device, so that further miniaturization of the main LCD device is restrained.

Method used

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  • LCD connected to additional LCD through multiple flexible printed circuit boards
  • LCD connected to additional LCD through multiple flexible printed circuit boards
  • LCD connected to additional LCD through multiple flexible printed circuit boards

Examples

Experimental program
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first embodiment

[0024]A liquid crystal module according to the invention will be described hereunder with reference to the drawings.

[0025]Referring to FIGS. 1 and 2, the liquid crystal module has a configuration including a main liquid crystal display (LCD) device 1 and a subordinate LCD device 2 formed such that liquid crystal is hermetically filled between respective upper glass plates 1a and 2a and respective base glass plates 1b and 2b. The configuration includes a single-sided wiring flexible substrate 3a as a first flexible substrate on which a liquid crystal driver 4 is mounted as a common semiconductor chip for driving the LCD devices 1 and 2, and a double-sided wiring flexible substrate 7a as a second flexible substrate having patterns of signal transmission wiring formed on both sides thereof. In one edge portion of the single-sided wiring flexible substrate 3a, driving common wiring 5b of the main LCD device 1 and segment wiring 5a thereof which are led out from the liquid crystal driver...

second embodiment

[0029]a liquid crystal module according to the invention will be described hereinbelow with reference to the drawings.

[0030]As shown in FIG. 4, in one edge portion of a single-sided wiring flexible substrate 3a, provided as the first flexible substrate on which a liquid crystal driver 4 for commonly driving a main LCD device 1 and a subordinate LCD device 2 is mounted, the main LCD device 1 is electrically connected via a conductive adhesive 8 such as an ACF. Additionally, the single-sided wiring flexible substrate 3a is electrically connected to a subordinate LCD device 2 via a single-sided wiring flexible substrate 7b provided as the second flexible substrate having wiring formed on one side thereof.

[0031]Wiring 11 formed on one side of a base film 12 of the single-sided wiring flexible substrate 7b is electrically connected with the driving common wiring of the subordinate LCD device 2 and the segment wiring thereof which are led out from the liquid crystal driver 4 mounted on th...

third embodiment

[0034]a liquid crystal module according to the invention will be described hereinbelow with reference to the drawings.

[0035]As shown in FIG. 5, a single-sided wiring flexible substrate 3a, provided as the first flexible substrate on which a liquid crystal driver 4 for commonly driving a main LCD device 1 and a subordinate LCD device is mounted is directly electrically connected with the main LCD device 1 via a conductive adhesive 8 such as an ACF. Additionally, the single-sided wiring flexible substrate 3a is electrically connected to the subordinate LCD device 2 via two flexible substrates 7b and 7c provided as second flexible substrates having wiring formed on one side thereof.

[0036]Wiring 11 formed on one side of a base film 12 of the single-sided wiring flexible substrate 7b is electrically connected with the driving common wiring of the subordinate LCD device 2 and the segment wiring thereof, which are led out from the liquid crystal driver 4 mounted on the single-sided wiring ...

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Abstract

This invention is to provide a liquid crystal module that enables a liquid crystal display (LCD) device to be further miniaturized. The liquid crystal module is configured to include at least two LCD devices and formed separately from each other, a first flexible substrate on which a semiconductor chip for driving the LCD devices and is mounted, and a second flexible substrate wherein signal transmission wiring is formed. One of the LCD devices and is electrically connected to the first flexible substrate, the other one of the LCD devices and is electrically connected to the second flexible substrate, and the first flexible substrate is electrically connected to the second flexible substrate.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to a liquid crystal module including a structure of flexible substrates (which are each called a “tape carrier”) on which, for example, semiconductor chips and passive components for driving liquid crystal display (LCD) devices are mounted, and LCD devices.[0003]2. Description of Related Art[0004]With widespread use of cellular mobile phones in recent few years, rapid progress has been achieved in the aspect of their functionality with high added value or significant benefits. In addition to the aspects of software functions, such as motion-picture playback functions and Internet connection functions, significant advance has been accomplished also in the aspects of hardware functions such as those of camera functions. Among these functions, mainstreams are not only main LCD devices mainly for using, for example, conventional telephone functions and Internet functions, but also are cellular mobile p...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02F1/1345G02F1/1333G02F1/13G09F9/00G09F9/35G09F9/40H05K1/14
CPCG02F1/13452H05K1/147H04M2250/16G02F2001/133342G02F1/133342F24F1/32F24F13/32
Inventor YAMAJI, YASUHISACHIKAWA, YASUNORIOHISHI, TSUKASA
Owner SHARP KK